JPS6027603B2 - elevator conveyor - Google Patents

Description

TECHNICAL FIELD The present invention relates to an elevator conveyor for conveying bulk material on a predetermined path, at least in part extending in a vertical or substantially vertical direction, and in particular to provide a pair of juxtaposed belts, disposing bulk material between the belts and passing at least one of the juxtaposed belts along and through the air box as the juxtaposed belts pass through a vertical or nearly vertically extending portion of the predetermined path; An elevator conveyor that presses the belts toward each other by applying air pressure directly to the belt surface on the side opposite to the side that contacts the bulk material, and conveys the bulk material in a vertical direction by pressing and holding the bulk material between the juxtaposed belts. It is related to.

Such an elevator conveyor is referred to as a "specific elevator conveyor" in this specification, and this elevator conveyor is referred to in Tokusei Sho 47-4, which is a publication of Sagigao No. 58391, filed by the applicant.
No. 522 (Special Publication No. 53622353)
The basic operating principle is fully described in the applicant's earlier application. Prior Art As previously described by the applicant, one or both belts may be passed through a single air box to apply air pressure to one or both belts, or each belt may be passed through a separate air box. This applies air pressure to the belt.

In any case, a device must be provided to reduce the amount of air escaping from the ends of the air box into which the belt enters and exits. However, if both belts are subjected to air pressure generated in respective individual air boxes, provision must be made to reduce the amount of air leaking from each individual air box via adjacent belt surfaces. OBJECTS OF THE INVENTION Accordingly, an object of the present invention is to provide an elevator conveyor in which the amount of air leaking from the individual air boxes via each belt can be reliably kept to a minimum.

Arrangements and Effects of the Invention To achieve this object, the present invention comprises a pair of juxtaposed belts, with a belt between the belts for conveying bulk material over a predetermined path that extends at least in part in a vertical or near-vertical direction. At least one of these belts is passed through an elongated air box when the bulk material is placed and passes through a vertical or near-vertical path section, and a pneumatic device is directly applied to the outer surface of either belt through the air box. The belts are pressed against each other to clamp the bulk material, the longitudinal side portions of the belts are pressed together, and sealing strips are provided to prevent large amounts of air from escaping from the air box. In the elevator conveyor, at least one of the belts is pressed by a pressing means with a light pressing force.
and a mirror-like closing pongee strip having one end edge attached to the sealing strip and the opposite end edge attached to the air box, and a large amount of closure strip from the air box is provided. In addition to reliably sealing air leaks, the closing pongee strips take on an almost arcuate curved shape when the conveyor is in operation, and pressure greater than atmospheric pressure inside the air box acts on the arcuate curved surface to seal the box. It is characterized by a structure that balances the pressing force acting on the pongee strips.

This arrangement according to the invention creates an effective air seal between the air box and the belt and prevents large amounts of air from escaping from the air box.

A further important point is that the sealing strip is not pressed against the belt with a force greater than the above-atmospheric pressure generated in the air box. The presence of such large forces creates a significant frictional resistance to belt movement and results in belt friction losses and wear. According to the present invention, the movable closing strips that take on a substantially semicircular shape under pressurized conditions are provided, so that the effect of almost eliminating the force acting on the closing strips under pressure higher than atmospheric pressure is achieved. can get. The sealing pongee strip according to the invention is useful when it creates a seal between the longitudinal lateral parts of the belt and the air box part opposite this part, and also at the lateral end parts of the air box from which the belt exits the air box. It can be applied to both cases where a seal is created between the belt and the belt facing this part.

As for the lateral end portion where the belt enters the air box, it can be adapted as required. Furthermore, since the closure strips are treated as sacrificial closure strips, the closure strips can be easily moved to accommodate changes in the degree of deformation of the belt caused by the material interposed between the belts. can.

Example Next, embodiments of the present invention will be described with reference to the drawings.

Figures 1 to 3 show belts 21'', 22 and air boxes 34, 3.
5, the air boxes 34, 35 are mechanically connected to each other by a pair of support columns 115 separated from each other.

Each column is rigidly connected to a pair of rigid support brackets 161, which support brackets 161 do not change under pressures above atmospheric within the air box. Each pair of support brackets 161 is provided with a pair of stainless steel sealing strips 162a, 162b. Between these sealing strips 162a and 162b are belts 21 and 22.
Sandwich the juxtaposed lateral parts of. -Each blockade pongee 1
62h is attached to the lower support bracket 16 in the drawing via a mounting block 163 extending in the (longitudinal) direction.
Attach firmly to 1. The closure strip 1,062b is attached to the mounting block 16'3.A long and narrow movable closure strip 164 made of plastic rubber or the like is attached in the vertical (longitudinal) direction of the support bracket 161 and the closure strip 162 as seen in the drawing. It is sealed and attached to the end twill part.One vertical (longitudinal) direction of the pressing means 165 made of an elongated spring net (plate spring) is attached to the elongated mounting member 165a attached to the lower side of the upper support bracket 161 as seen in the drawing. The edges are installed in a cantilevered state.The vertical end opposite to the pressing pongee strip 165 is attached in green to the upper sealing pongee strip 162a.
This sealing pongee strip 162a is pressed. In this way, the upper closing strip 1'62a is maneuverable and is pressed lightly against the edge green of the belt. In this way, the closure strip 164 on the one hand and the mounting block 163 on the other hand reliably seal off the air boxes 34, 35, respectively, and prevent large amounts of air from escaping from the longitudinal side parts of the belt.

As clearly shown in FIG. 3, to the upper sealing pongee strip 162a,
It is formed by a series of sealing strip elements arranged in a sequential row, and each sealing strip element is hinged 16 at its outer longitudinal edge.
6 and the mounting member 165a via the mounting flange 167.
hinged to.

The inner longitudinal edges of the pair of sealing strips 162a, 162b are provided with outwardly flared portions 168 to prevent the belt edges from returning to their original positions if they become dislodged for any reason. To provide possible guidance and to facilitate insertion for belt efficiency.

According to the above-mentioned structure, each closing pongee strip 164 is curved into an arcuate shape to have a substantially semicircular shape during the operation of the elevator conveyor.

Due to this shape, the forces acting on the closure strips and the forces applied to the closure strips caused by pressure above atmospheric pressure almost cancel each other out, and the forces generated by the air pressure acting on the closure strips to press the closure strips against the belt. There is almost no power. In this way, conveyor friction losses and belt wear are reduced.
On the other hand, since the sealing fishing net strip is reliably pressed toward the belt by the moderate pressing force generated by the pressing pongee strip 165, it is possible to prevent a large amount of air from leaking from the air box. As seen in the drawing, the lower sealing pongee strip 162b is firmly attached to the rigid high mounting block 163L, so the lower sealing pongee strip 162b is not deformed by air pressure and is not unduly attached to the side portions of the belt. No pressing force can be applied. Furthermore, depending on the case, both of the sealing strips 162a and 162b can be attached flexibly and elastically. 4-8, a closure device will now be described which prevents large amounts of air from escaping from the upper and lower ends of the air box with respect to the belt.

Two different problems arise with regard to the sealing that must be achieved between the movable belt or belt drum, on the one hand, and the stationary box crossbody, on the other hand.

The first problem arises when the movable component (ie, belt or drum) has a fixed, unchanging shape. in this case,
The sealing of the air box to the movable components is carried out using simple flexible sealing elements, for example flexible (for example rubber) strips. A second problem arises when the movable component has a variable shape, in which case it is a variable sealing member, and this sealing characteristic automatically follows the shape of the movable component. , there shall be established blockades and villages that can coordinate with each other. In this case, the changing shape for the box conductor to be sealed is produced by the belt being deformed by the surrounding bulk material. 4th ~ explained below
In the embodiment shown in FIG. 8, only one belt 21 is deformed, and the other belt 22 passes through the cylindrical drum 33 in a substantially flat state. However, it is of course also possible to form the drum 33 in a suitable shape so that both belts 21, 22 are deformed by the surrounding bulk material. In the embodiments described with reference to Figures 4 to 8, reference is made only to the sealing between the upper end of the air box and the belt and drum opposite thereto, and the lower end of the air box and the belt and drum opposite thereto. The sealing between the two is explained with reference to Figures 2, 3 and 5 of the above-mentioned Honkoshihito's Senri Tokukan Publication No. 47-4522). As shown in FIGS. 4-8, each of the air boxes 34, 35 is formed as a generally channel-shaped horizontal body.

The air box 34 is constituted by a trim 141 and a side wall 142, and the vertical (longitudinal) edge of the side wall 142 is sealed against the longitudinal end twill portion of the belt by a sealing device shown in FIGS. 1-8. The lower end of the air box 34 is provided with a flexible strip as described in the above-mentioned article by the applicant and is lightly crimped onto the exposed surface of the drum. The air box 35 is composed of a trim 148 and a side wall 144, and at the upper end of the air box there is a lateral sealing groove similar to the sealing strip provided at the bottom of the air box as previously described by the applicant. 40, the sealing pongee strips extend along the edges of the trim and side walls and are crimped against the exposed surface of the drum 33.

As mentioned above, the sealing between the upper end of the air box 34 and the opposing belt 21 presents a special problem, namely that in the illustrated embodiment the belt 21 deforms as it surrounds the bulk material 63. The problem is that the degree of this deformation changes and the ultimate shape of the belt 21 changes from the completely flat shape shown in FIGS. 4 and 5 to the deformed shape shown in FIGS. 6 and 7.

To solve this problem, an upper sealing device 36 is provided.

The closure device 36 is constituted by a diaphragm or closure strip 146 which is generally rectangular and made of rubber or other flexible elastic material. The end edge of this diaphragm or closure strip 146 is sealed and connected to the end edge green 147 of the trim 141 of the air box 34. The side edge of the diaphragm, ie, the closing pongee strip 146, is also attached to the side wall 142 of the air box 34.
Seal and connect to the edge of the Rivet 148a at the lowest end of a series of slender and malleable stainless steel sealing strips 148.
The intermediate part of the sealing pongee strip is attached to the end edge of the diaphragm 146 on the opposite side from the end edge 147 with a rivet 1501 (the eighth
(see figure).

These series of sealing strips are arranged and attached to the surface of the belt 21 by a portable diaphragm closure strip 146 so as to be lightly pressed against the surface of the belt 21, so that the surface of the sealing strips that are pressed against the belt 21 will not be affected by any deformation of the belt 21. It is also possible to easily make suitable modifications. When the air box 34 is pressurized by air pressure, the air pressure causes the diaphragm 146 to expand and assume an arcuate cross-sectional shape as shown in FIGS. 5 and 7.

The intervals between the sealing pongee strips 148 are such that they are separated from each other by a sufficient distance to allow self-adjustment of the position relative to the shape of the belt, and
The interval between the sealing pongee strip 148 and the air box 34 is made small enough so that there is almost no air loss. 6 and 7, the sealing pongee strip 148 is crimped onto the deformed belt 21 and the air box 3
4 shows a state in which a large amount of air is prevented from leaking from the upper end.

These sealing strips 148 are preferably made of any low-friction material with good spring resistance, such as stainless steel, and have a thin cross-section.

In the practical example, the stainless steel thickness of the sealing strip was 2 mm. The shape of the diaphragm or closure strip and the spacing of the closure strips should be such that they maintain effective contact with the belt at all times and are easily displaceable. By providing a considerable number of sealing strips (28 sealing strips were used in a particular practical embodiment), the amount of air escaping through the gaps between the sealing strips can be controlled. In this way, as explained with reference to Figures 1 to 3, the closing pongee strip is attached to the flexible closing strip, which assumes an approximately semicircular shape during operation of the conveyor and is pneumatically sealed. There is little force on the strip, which reduces conveyor friction losses and belt wear.

Although in the embodiment described above the diaphragm closure strip 146 is inflated by air pressure within the air box 34, other independent sources of air pressure may alternatively be used for this inflation. Due to the special construction of the elevator conveyor described above, exemplifying the case in which the vertical chain region is adjacent to the exposed belt portion above the bottom drum, the deformation of the belt giving the variable shape of the belt 21 is limited to the case where the belt It can be seen that this occurs only after passing through the drum.

As a result, belt 2 with respect to the drum at the bottom of the air box
Sealing the lowermost parts of 1 and 22 is carried out by a simple flexible strip. However, under conditions where the already warped belt moves in and out of the air box, the fourth
A closure device 36 of the type described for Figures 1 to 8 should also be used in the lower region of the air box. Brief explanation of drawings 1st
2 is a cross-sectional view of an elevator conveyor according to the invention using a special sealing device; FIG. 3
1 and 2; FIG. 4 shows the absence of bulk material between the belts of the closure device in the position of the top diverting drum of the elevator conveyor according to the invention; FIG. FIG. 5 is a partial vertical sectional view taken along line V-V in FIG. 4; FIG. 6 is a plan view similar to FIG. 4 with bulk material present between the belts; FIG. The figure is a partial longitudinal cross-sectional view taken along the skin line of FIG. 6, and FIG. 8 is a front view of the side of the sealing device shown in FIGS. 4 to 7 that contacts the belt.

21, 22... Belt, 33... Drum, 34, 35.
...Air box, 36...Sealing device, 63...
... Bulk material, 115 ... Support column, 141,
143... Air box neatness, 142, 144...
...Air box side wall, 146, 164...Closing pongee strip, 148, 162a, 162b...Closing pongee strip, 148a, 150...Rivet, 161
......Support bracket, 163...Mounting bracket, 165...Press pongee strip, 165a...
・Mounting member, 166...Hinge, 167...
・Mounting flange, 168...flare part.

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Claims (1)

[Claims] 1. For conveying bulk material over a predetermined path at least partially extending in a vertical or near-vertical direction; 1
comprising a pair of juxtaposed belts 21, 22, between which the bulk material 68 is arranged, at least one of the belts being passed through an elongated air box 34, 35 when passing through a vertical or near-vertical path section; A pneumatic device is applied directly to either vertical outer surface through an air box,
In an elevator conveyor in which the belts are pressed together to clamp the bulk material, the longitudinal side parts of the belts are pressed together and are provided with a sealing device to prevent large amounts of air from escaping from the air box. At least one sealing strip 162a or 162b, 148 is pressed against the sealing strip 21, 22 with a light pressing force, and one end edge is attached to said sealing strip and the opposite end edge is inflated. Flexible closure strips 164, 146 attached to the box are provided to ensure that large amounts of air escape from the air box and that the closure strips have a generally arcuate curved shape during operation of the conveyor. An elevator conveyor characterized in that a pressure equal to or higher than atmospheric pressure in the air box acts on an arcuate curved surface to balance the pressing force acting on the sealing strips. 2. The closure strip also prevents large amounts of air from escaping from the longitudinal side portions of the belt, and the flexible closure strip is secured to the air box by a rigid first support bracket. An elevator conveyor according to claim 1, characterized in that: 3 Associating each belt with a separate air box, at least one on each pair of mutually juxtaposed longitudinal side portions of the belt.
3. An elevator conveyor as claimed in claim 2, characterized in that the elevator conveyor is provided with several sealing strips. 4. The sealing strip associated with the longitudinal side portion of one of the belts is fixed to an elongated mounting block to which a second rigid support bracket is attached.
Elevator conveyor as described. 5. An elevator conveyor as claimed in any one of claims 2 to 4, characterized in that the pressing means comprises a pressing strip formed by a series of leaf springs attached to the first support bracket. 6. Elevator conveyor according to any one of claims 2 to 5, characterized in that the outermost edges of each of the mutually aligned blocking strips are rotatably connected to the first support bracket. 7. Elevator conveyor according to any one of claims 3 to 6, characterized in that the closure strip is constructed with an outwardly expanding flared portion at the innermost edge of the closure strip. 8 The closure strips prevent large amounts of air from escaping from the lateral parts of the belt adjacent to the air box openings, and the one end edge of each closure strip is connected to the edge of the corresponding end of the air box. and the opposite end edges of the closure strips are attached to a series of closure strips arranged parallel to each other, which closure strips are fixed to said end edges of the air box and directed towards the belt. The elevator conveyor according to claim 1, wherein the elevator conveyor is pressed by a spring force.